Phenyl high folding silica gel formula composition and methyl low folding silica gel is similar, mainly composed of phenyl vinyl silicone resin, phenyl vinyl silicone oil, phenyl hydrogen crosslinking agent, viscosifier, platinum catalyst and inhibitors, usually in the LED industry common high folding glue refractive gt; 1.50.


The loss of photons produced by LED chip radiating compound mainly includes three aspects when they are emitted outward: the internal structure defect of the chip and the absorption of materials; the reflection loss caused by the difference of refractive index of photons at the exit interface; and the total reflection loss caused by the incident Angle greater than the critical Angle of total reflection. High refractive LED encapsulated silica gel is located between the chip and the air, which can effectively reduce the loss of photon in the interface layer to improve the light extraction efficiency, and can increase the total reflection Angle of light emitted from the chip, reduce the light emission loss and improve the light efficiency. With the advantages of high light efficiency brought by high refraction and high sulfur resistance brought by low oxygen and moisture permeability, phenyl high folding silica gel currently occupies the mainstream of SMD LED packaging market.